Math.asin() - JavaScript | MDN
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// Calculates angle of a right-angle triangle in radians
function calcAngle(opposite, hypotenuse) {
return Math.asin(opposite / hypotenuse);
}
console.log(calcAngle(6, 10));
// Expected output: 0.6435011087932844
console.log(calcAngle(5, 3));
// Expected output: NaN
Syntax
Parameters
x-
A number between -1 and 1, inclusive, representing the angle's sine value.
Return value
The inverse sine (angle in radians between and , inclusive) of x. If x is less than -1 or greater than 1, returns NaN.
Description
Because asin() is a static method of Math, you always use it as Math.asin(), rather than as a method of a Math object you created (Math is not a constructor).
Examples
Using Math.asin()
js
Math.asin(-2); // NaN
Math.asin(-1); // -1.5707963267948966 (-π/2)
Math.asin(-0); // -0
Math.asin(0); // 0
Math.asin(0.5); // 0.5235987755982989 (π/6)
Math.asin(1); // 1.5707963267948966 (π/2)
Math.asin(2); // NaN
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-math.asin |
Browser compatibility
See also
Math.acos()Math.atan()Math.atan2()Math.cos()Math.sin()Math.tan()- CSS
asin()function